Privacy and security
What Syncydo can see
Plain answers for you and your IT team. Last updated November 11, 2026.
What your colleagues and clients see
A hold that says Busy, at the times you're taken. Nothing else. On Plus you can choose other wording for holds, and on Pro you can copy the original title onto them. Both are off until you turn them on.
What Syncydo asks permission for
| Calendar | Permission | Why |
|---|---|---|
calendar.eventscalendar.calendarlist.readonly | Read when you're busy, write and update Busy holds, and list your calendars so you can pick which ones to use. | |
| Microsoft 365 and Outlook | Calendars.ReadWriteUser.Readoffline_access | Read and write calendar events, know which account you connected, and stay connected without asking you to sign in again. No access to your email. |
| Zoho | ZohoCalendar.calendar.READZohoCalendar.event.ALLAaaServer.profile.Read | List your calendars, read when you're busy, write holds, and know which account you connected. |
| iPhone and Android calendars | Calendar access on your phone | The app sends Syncydo only each calendar's name and your busy times. Titles and details stay on the phone. |
What Syncydo keeps
- Your account: your email address. If you sign in with email, a password hash and your two-step secret.
- Calendar access: the permission above, encrypted with a key unique to your account.
- Busy times: when your events start and end, so the right time can be held elsewhere.
- Your next two weeks of meetings: titles, times, locations, join links and your response, encrypted with your account's key, so your agenda opens quickly. Older meetings drop off as days pass.
- A one-way fingerprint of each event, so a hold can be kept up to date. It can't be turned back into a title.
- How you found us: the campaign name in the link you followed and the name of the site that sent you.
Encrypted, and synced for you around the clock. Your calendar access and upcoming meetings are encrypted with a key unique to your account. Syncydo's servers unlock them only to keep your calendars in step, which is how holds keep updating while your phone and laptop are off.
What Syncydo never does
- Sell your data, show ads, or use your calendars to train AI models.
- Read your email.
- Leave holds behind: disconnect a calendar or delete your account and every hold Syncydo wrote is removed.
AI assistants
On Plus and Pro you can let an assistant such as Claude, ChatGPT or Gemini read your agenda. It is read-only: it can list your calendars, read your agenda and find free time. You approve each assistant, and you can disconnect it at any time from Configure.
Where your data lives
Syncydo runs on Cloudflare (hosting, database and email). Payments are handled by Stripe, which keeps your card details; Syncydo never sees your card number. All traffic uses HTTPS.
Verified by Google
| Verified Google reviewed and approved Syncydo's calendar access. |
For IT admins
Many Microsoft 365 workplaces need an admin to approve new apps. Our page for IT admins lets you approve Syncydo for everyone in one step.
Questions or a security report
Email hello@syncydo.com. Our privacy policy has the full details.